Covington, M. V. (1992). Making the grade: A self-worth perspective on motivation and school reform. Cambridge University Press.
Dyfyniad Arddull ChicagoCovington, Martin V. Making the Grade: A Self-worth Perspective on Motivation and School Reform. Cambridge ; New York: Cambridge University Press, 1992.
Dyfyniad MLACovington, Martin V. Making the Grade: A Self-worth Perspective on Motivation and School Reform. Cambridge University Press, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.